Tank is big enough, introduce at the same time. These tangs are usually peaceful anyway
Its unlikely they will fight especially in a relatively new setting
More importantly, wheres the pics of these beauties
What are the dimensions of the tank?
Needs a lot more rock. Is that wood in there?
96"x48"x28"
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Buy whatever rock you want and then make larger rock designs from it using e-Marco 400 (hydraulic cement). This stuff works really well and allows you to build whatever you want. No need to spend a ton of money to have someone else build something.
Those dimensions are great! What kind of filtration are you running? Please create a "build" thread!